AT83SND2CMP3B datasheet(148/241 Pages) ATMEL

148 / 241 page

148

4341F–MP3–03/06

AT8xC51SND2C/MP3B

Figure 18-19.

Data Block Reception Flows

18.6.5

Flow Control

To allow transfer at high speed without taking care of CPU oscillator frequency, the FLOWC bit

in MMCON2 allows control of the data flow in both transmission and reception.

During transmission, setting the FLOWC bit has the following effects:

•

MMCLK is stopped when both FIFOs become empty: F1EI and F2EI set.

•

MMCLK is restarted when one of the FIFOs becomes full: F1EI or F2EI cleared.

During reception, setting the FLOWC bit has the following effects:

•

MMCLK is stopped when both FIFOs become full: F1FI and F2FI set.

•

MMCLK is restarted when one of the FIFOs becomes empty: F1FI or F2FI cleared.

As soon as the clock is stopped, the MMC bus is frozen and remains in its state until the clock is

restored by writing or reading data in MMDAT.

18.7

Interrupt

18.7.1

Description

As shown in Figure 18-20, the MMC controller implements eight interrupt sources reported in

MCBI, EORI, EOCI, EOFI, F2FI, F1FI, and F2EI flags in MMCINT register. These flags are

detailed in the previous sections.

All these sources are maskable separately using MCBM, EORM, EOCM, EOFM, F2FM, F1FM,

and F2EM mask bits respectively in MMMSK register.

Data Block

Reception

Start Transmission

DATEN = 1

DATEN = 0

FIFO Full?

F1EI or F2EI = 1?

FIFO Reading

read 8 data from MMDAT

No More Data

To Receive?

a. Polling mode

Data Block

Initialization

Start Transmission

DATEN = 1

DATEN = 0

Data Block

Reception ISR

FIFO Reading

read 8 data from MMDAT

No More Data

To Receive?

b. Interrupt mode

FIFO Full?

F1EI or F2EI = 1?

Mask FIFOs Full

F1FM = 1

F2FM = 1

Unmask FIFOs Full

F1FM = 0

F2FM = 0

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